Zobrazeno 1 - 10
of 638
pro vyhledávání: '"Boffetta G"'
It has been long known that the addition of linear friction on two-dimensional Navier-Stokes (NS) turbulence, often referred to as Ekman-Navier-Stokes (ENS) turbulence, induces strong intermittent fluctuations on small-scale vorticity. Such fluctuati
Externí odkaz:
http://arxiv.org/abs/2408.15735
We study the temporal fluctuations of the flux of surface potential energy in Surface Quasi-Geostrophic (SQG) turbulence. By means of high-resolution, direct numerical simulations of the SQG model in the regime of forced and dissipated cascade of tem
Externí odkaz:
http://arxiv.org/abs/2406.07235
We study the statistics of free-surface turbulence at large Reynolds numbers produced by direct numerical simulations in a fluid layer at different thickness with fixed characteristic forcing scale. We observe the production of a transient inverse ca
Externí odkaz:
http://arxiv.org/abs/2212.04627
We study, by means of extensive direct numerical simulations, the turbulent flow produced by a two-dimensional cellular forcing in a cubic box with periodic boundary conditions. In spite of the strong anisotropy of the forcing, we find that turbulenc
Externí odkaz:
http://arxiv.org/abs/2211.10731
Publikováno v:
Physical Review E 106 055103 (2022)
We report the numerical evidence of a new state of active turbulence in confined domains. By means of extensive numerical simulations of the Toner-Tu-Swift-Hohenberg model for dense bacterial suspensions in circular geometry, we discover the formatio
Externí odkaz:
http://arxiv.org/abs/2206.09655
Publikováno v:
Phys. Rev. Fluids 7, 074603 (2022)
Many aquatic microorganisms are able to swim. In natural environments they typically do so in the presence of flows. In recent years it has been shown that the interplay of swimming and flows can give rise to interesting and biologically relevant phe
Externí odkaz:
http://arxiv.org/abs/2203.04833
We report of a series of laboratory experiments and numerical simulations of freely-decaying rotating turbulent flows confined in domains with variable height. We show that the vertical confinement has important effects on the formation of large-scal
Externí odkaz:
http://arxiv.org/abs/2012.14676
Publikováno v:
Phys. Rev. Fluids 5, 094302 (2020)
Particles suspended in a fluid exert feedback forces that can significantly impact the flow, altering the turbulent drag and velocity fluctuations. We study flow modulation induced by particles heavier than the carrier fluid in the framework of an Eu
Externí odkaz:
http://arxiv.org/abs/2006.09331
Pushing two fluids with different density one against the other causes the development of the Rayleigh-Taylor instability at their interface, which further evolves in a complex mixing layer. In porous media, this process is influenced by the viscous
Externí odkaz:
http://arxiv.org/abs/2006.07175
Publikováno v:
Phys. Rev. Fluids 5, 074303 (2020)
We investigate the effects of turbulent fluctuations on the Lagrangian statistics of absorption of a scalar field by tracer particles, as a model for nutrient uptake by suspended non-motile microorganisms. By means of extensive direct numerical simul
Externí odkaz:
http://arxiv.org/abs/2004.10256